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For civil valves,every country has their own design standard.So we have euro design brass stop valves,Asian design stainless stop valves.Today CMEC,a professional supplier of civil valves, is going to have a relatively specific introduction to EURO design brass stop valves installation secrete.
The brass stop valve is designed to prevent the water from flowing out of use when the pump is installed at a position lower than the water level of the tank.
So when you are installing the stop valves,please note that when installed, the connection must be tight and prevent the pipe from slipping off.
No need to accept the reverse valve, then the air will be much smaller.
Even if the pump is lower than the outlet can not take, the water will not turn back, because there is air inside the trachea, that point of water pressure is not enough to return the water back to the pump body.